Originally designed for service providers, the Cisco IGX 8400 series offers carrier-class reliability, ensuring that vital business applications are always available. All Cisco IGX 8400 series common equipment can be configured redundantly for maximum platform reliability. New software releases can be remotely downloaded onto the redundant processor for background installation while traffic continues to run. The Cisco IGX 8400 series features an advanced distributed intelligence algorithm that enables the network to automatically route new connections and, if necessary, reroute traffic around failures in network facilities.This bundle includes 4 Power Entry Modules.